... mark control .8.Original unequal amplitude and phase alarm9.Full digital computer parameter adjustment.10.Soft or hard disc storage ... amplitude vectors.15.Double or single strip chart display on full screen of LCD16.Phase and amplitude auto-measurement17.Analog X and ... : Differential, absolute, reflection, I.D, O.D.22.Display screen size:15" diagonal, magnetic deflection23.Sweep: A-sweep display 24 ...